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SUBTRACTION Self-Correcting Quiz - NINES

1
16
-  9
2
15
-  9
3
17
-  9
4
13
-  9
5
18
-  9
6
18
-  9
7
16
-  9
8
11
-  9
9
12
-  9
10
13
-  9
11
11
-  9
12
17
-  9
13
15
-  9
14
14
-  9
15
14
-  9
16
10
-  9
17
12
-  9
18
10
-  9
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